Campbell CR9000, Instruction Manual

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Section 3. CR9000 Measurement Details
3-18
CR9050(E) are multiplexed sequentially through a single A to D
converter.
3.2.1 CR9058E Supported Instructions
The CR9058E currently supports three CR9000X measurement instructions:
1. VoltDiff (Dest, Reps, Range, ASlot, DiffChan, RevDiff, Settle, Integ,
Mult, Offset)
2. TCDiff (Dest, Reps, Range, ASlot, DiffChan, TCType, TRef, RevDiff,
Settle, Integ, Mult, Offset)
3. ModuleTemp (Dest, Reps, ASlot, Integ)
These instructions operate the same as with the CR9050 with these differences:
•
DiffChan must be within 1..10.
•
VoltDiff supports these voltage ranges: V2 (+/- 2 Volts DC), V2C (+/- 2
Volts with open thermocouple checking), V20 (+/- 20 Volts DC), and
V60 (+/- 60 Volts DC).
•
TCDiff will work with the same range settings as the VoltDiff instruction,
but only V2 (no open thermocouple checking) or V2C ( +/-2 volt range
with open thermocouple checking) should be used with TCDiff. When the
range is set = V2C, an open circuit will report an over-range condition to
the CR9000X.
•
The Settle time parameter is unused.
•
The minimum scan time when using the VoltDiff instruction, without
input reversal, for the CR9058E is 1290 microseconds for integration
times under 200 microseconds. If the integration time is greater than 200
microseconds, then the minimum scan interval is 1090 + integration time
(microseconds). When using the VoltDiff instruction with input reversal
and integration under 200 microseconds, the minimum scan interval is
2990 microseconds. With input reversal and integration times greater than
200 microseconds, the minimum scan time is (2790 + (2 x integration
time)).
•
The minimum scan time when using the TCDiff instruction, without input
reversal, for the CR9058E is 2570 microseconds for integration times
under 200 microseconds. If the integration time is greater than 200
microseconds, then the minimum scan interval is 1370 + integration time
(microseconds). When using the VoltDiff instruction with input reversal
and integration under 200 microseconds, the minimum scan interval is
4280 microseconds. When using input reversal and integration times
greater than 200 microseconds, the minimum scan time is (4080 + (2 x
integration time)).