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Table of contents for the manual
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SDM-CVO4 4-Channel Current/Voltage Output Module User Guide Issued: 13.3.08 Copyright © 2001-2007 C ampbell Scientific Inc. Printed under Licence by Cam pbell Scient ific Ltd. CSL 436[...]
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Guarantee This equipment is guaranteed against defects in materials and workmanship. This guarantee applies for twelve months from date of delivery. We will repair or replace products which prove to be defective during the guarantee period provided they are returned to us prepaid. The guarantee will not apply to: • Equipment which has been modifi[...]
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Contents 1. Introduction .................................................................. 1 2. Specifications .............................................................. 2 2.1 General Specifications .............................................................................. 2 2.2 Output Sp ecifications.......................................[...]
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Contents Tables 4-1. Datalogger to SD M-CVO4 Connections................................................. 4 4-2. Switch Position and Addresses ............................................................. 10 6-1. Description of Instruction 103 .............................................................. 14 ii[...]
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SDM-CVO4 4-Channel Current/Voltage Output Module The SDM-CVO4 is a synchronously addressed dat alogger peripheral designed to allow the datalogger to output variable voltage or current signals under program control. Figure 1. SDM-CVO4 (shown without mounting brackets) 1. Introduction The SDM-CVO4 expands the analogue out put capability of Campbell [...]
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SDM-CVO4 4-Channel Current/Voltage Output Module The SDM-CVO4 is a synchronously addre ssed data logger peripheral. Datalogger control ports 1, 2 and 3 are used to address the SDM -CVO4 and send out data that defines the desired voltage/c urrent output of each of th e four channels. The output levels are set by four values i n successive input loca[...]
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Instruction Manual 2.2 Output Specifications Voltage Mode: Range: 0 – 10,000 m V Resolution: 2.5 mV Maxim um Output Current : 30 mA per channel. Minimum load current: 5 μ A if output < 200 m V. A ccuracy (+23 ° C) ± 0.02% of set voltage, + ( ± 2.5 mV). A ccuracy (-25 to +50 ° C) ± 0.13% of set voltage, + ( ± 2.5 mV). Current Mode: Range[...]
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SDM-CVO4 4-Channel Current/Voltage Output Module 3. Power Considerations The SDM-CVO4 power requireme nts are large compared to most Cam pbell Scientific products, especi ally when driving signi ficant loads. Care m ust be taken to ensure that the power supply can cope wi th this higher dem and. Alkaline batteries are not recomm ended for long term[...]
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Instruction Manual insert a small screwdriver into either the top or front slot, as appropriate , and push to open the term inal spring. Strip any i nsulation from the wire to give 7 to 9 m m bare wire. Push the wire into the opening, and, whi le holding it i n position, withdraw the screwdriver to release the sp rin g. The wire will now be firmly [...]
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SDM-CVO4 4-Channel Current/Voltage Output Module 4.2 Output Device Connections For each output channel there are f our terminals which are labelled V o , Id plus there are two ground ( ) connections per channel. The two ground term inals are internally connected; two are provided for convenience. 4.2.1 Voltage Output Mode The V o terminal is the ou[...]
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Instruction Manual a) The remote device powers the l oop, where, depending on the ground referencing requirement s of that device, the connecti on can be as shown in the diagrams below: V+ Remote Vol tage Source +ve Remote Current Input V- CVO4 + – I d or V+ CVO4 Remote Current Input V- + I d b) The SDM-CVO4 provides the voltage source t o drive [...]
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SDM-CVO4 4-Channel Current/Voltage Output Module 4.2.3 Shield and Ground Connections It is generally advi sable to used shie lded (screened) cable when connecting the output to any rem ote system to reduce the chances of noise pickup. The shield will only be effective if it is conn ected to a good ground reference point. As a result of the isolati [...]
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Instruction Manual Select channel(s) by fitting jumper (s) between appropriate terminals. (Current mode only.) Jumper shown fitted to ‘enable’ Channel 4. Jumper shown fitted in the unconnected ‘stored’ p osition. Figure 4-3. Location of Jumpers on Circuit Board Do not store the jumpers between any other pins in the block as this may switch [...]
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SDM-CVO4 4-Channel Current/Voltage Output Module Table 4-2. Switch Position and Addresses Sw itch Setting Base 4 Address 0 00 1 01 2 02 3 03 4 10 5 11 6 12 7 13 8 20 9 21 A 22 B 23 C 30 D 31 E 32 F 33 Use a screwdriver to select address Figure 4-4. Address Selection Switch The address switch has a hexadecim al setting posit ion (0..F). Most datalog[...]
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Instruction Manual Where the SDM-CVO4 is going to be used in applications where the po tential difference between the datalogger and the output terminals exceeds 50 V RMS AC, 74 VDC then careful considerati on has to be taken to ensure safe operation and compliance with local safety regu latio n s. For such application s Campbell Scientific does no[...]
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SDM-CVO4 4-Channel Current/Voltage Output Module this device is at the low end of its to lerance band (±10%), combined with the normal tolerance of flash test devi ces, then the spark gap could fire during a 1500 VAC flash test , which may cause an indication of failure. Testing at a slightly lower voltag e will confirm whether there is a true fau[...]
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Instruction Manual compensated for. With the SDM-CVO4 as an ex citation source, any drift in its output accuracy, or of the logger m easurem ent accuracy, can result in a combination of those errors. It is wort h investigating, therefore, the exact requirements of t he sensors you wish to use. For instance, on closer inspecti on of the specificatio[...]
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SDM-CVO4 4-Channel Current/Voltage Output Module range of -20 ° C to +50 ° C would be scaled so at -20C the output is 0 m V and at +50 ° C the output is 10000 m V. To do this with t he SDM-CVO4 you would use the mathem atical functions of the datal ogger to calculate a scaled value in a new input location, so that t he value is -5000 when the te[...]
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Instruction Manual If the SDM-CVO4 loses power for any reas on, when power is restored the outputs will return to the default ‘off’ state. This will be held until the datalogger runs Instruction 103 again to update the output levels requi red. 6.2 Edlog Program Examples The following program exam ples are given to hel p you understand the gener[...]
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SDM-CVO4 4-Channel Current/Voltage Output Module 4: Volt (SE) (P1) 1: 1 Reps 2: 32 50 mV, 50 Hz Reject, Sl ow Range 3: 3 SE Channel 4: 4 Loc [ Radiation ] 5: 100 Mult 6: 0.0 Offset ; Now output data in t he normal way to final storage 5: If time is (P92) 1: 0 Minutes (Seconds --) into a 2: 1 Interval (same units as above) 3: 10 Set Output Flag Hi g[...]
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Instruction Manual 7: -1666.67 B3 8: 10 A4 9: -5000 B4 ; Now update the SDM-CVO4 wi th the information ; for the four channels 11: SDM-AO4 (P103) 1: 4 Reps 2: 30 SDM Address 3: 5 Loc [ ScldOut_1 ] 6.2.2 Restricted Range Curr ent Output Modes (4-20 mA) When driving a system that requires a rest ricted current range then the full-scale range is reduc[...]
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SDM-CVO4 4-Channel Current/Voltage Output Module ; then set the value to –3000 13: Z=F (P30) 1: -3000 F 2: 00 Exponent of 10 3: 5 -- Z Loc [ ScldOut_1 ] 14: End (P95) 15: End (P95) ; Now update the SDM-CVO4 wi th the information ; for the four channels 16: SDM-AO4 (P103) 1: 4 Reps 2: 30 SDM Address 3: 5 Loc [ ScldOut_1 ] 6.2.3 Providing Isolated [...]
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Instruction Manual ; Wait 100 m it to power-on an s for d the outputs to stabilize ; You ma increase this dela y need to y if the sensors ; themselves ; have a power-on delay 3: Excitation with Delay (P22) 1: 1 Ex Channel 2: 0000 Delay W/Ex (units = 0.01 sec) 3: 10 Delay After Ex (units = 0.01 sec) 4: 0000 mV Excit ation ; Take the four easurements[...]
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SDM-CVO4 4-Channel Current/Voltage Output Module 6.3 CRBasic SDMCVO4 Instruction This instruction is used to co ntrol the SDM-CVO4 four chann el cu rrent/voltage output device. Syntax SDMCVO4 ( CVO4Source, CVO4Reps , SDMAddress, CVO4Mode ) Remarks This instruction cont rols the SDM-CVO4, which out puts a voltage or a current. Internal jumpers are u[...]
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Instruction Manual be cycled on the dev ice to return it to its default state. Otherwise, if 0 or 1 is entered it will be i gnored and the device will remain in its last override st ate. Refer to Section 4.2.2 for connect ion details. 6.4 SDM-CVO4 Instruction Example This program exam ple is for a weather stat ion measuring wind speed, wi nd direct[...]
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SDM-CVO4 4-Channel Current/Voltage Output Module EndIf ' Scale the measurements for the SDM-CV O4 to output 0-10000 mV WSOut = WS_ms*200 'WS: 0-50 m /s = 0-10000 mV WDOut = WD_0_540 *18.59 'WD: 0-540 deg = 0-10000mV TempOut= 100*(Tem p_C+40) 'Tem p: -40-60 deg C = 0-10000 m V RHOut = RH *100 'R H: 0-100 % RH = 0-10000 mV &a[...]
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Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 Nort h Logan, Utah 84321 UNITED STATES www.campbellsci.com info@campbellsci.com Campbell Scientific Afri ca Pty. Lt d. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za sales@csafrica.co.za Campbell Scientific Aust ralia Pty. Ltd. (CSA) PO Box 444 Thurin[...]