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Number of channels: 4
Number of digits: 5½ (±199999 counts)
Full-scale ranges:
Range 1: ±19.9999 V, 100 µV res., 1.5 counts noise (rms)
Range 2: ±1.99999 V, 10 µV res., 0.8 counts noise (rms)
Range 3: ±999.99 mV, 10 µV res., 0.8 counts noise (rms)
Range 4: ±199.999 mV, 1 µV res., 1.0 counts noise (rms)
Accuracy: ±(% of reading + counts)
Range 1: 0.0010 + 2 (24 hr.), 0.0050 + 2 (90 day), 0.0080 + 2 (1 yr.)
Range 2: 0.0002 + 2 (24 hr.), 0.0050 + 2 (90 day), 0.0080 + 2 (1 yr.)
Range 3: 0.0002 + 2 (24 hr.), 0.0050 + 2 (90 day), 0.0080 + 2 (1 yr.)
Range 4: 0.0002 + 4 (24 hr.), 0.0050 + 6 (90 day), 0.0080 + 6 (1 yr.)
Transfer accuracy: (24 hour counts error)/2 [ 3 ][ 5 ] (typ.)
Input resistance: 10 MΩ ± 1 %, >3 GΩ selectable on ranges 2 to 4 [ 6 ]
Input terminals: BNC (Amphenol 31-10 or similar)
Input protection: ±60 V center to shield, ±200 V shield to earth
Triggering: Internal, external (TTL), or remote
BUSY output: TTL logic high when busy
Update rate: 3.6/s (60 Hz), 3.0/s (50 Hz)
Normal mode rejection: 90 dB (59 Hz to 61 Hz or 49 Hz to 51 Hz)
CMRR (at DC): 125 dB (for 1 kΩ unbalance in the shield)
Settling time: 1 s to within 3 counts of final reading on ranges 1 to 3, 8 s on range 4
Display: Red LED, 0.40", with polarity indication. Green LED for range and autorange indication
Operating temperature: 0 °C to 40 °C (non-condensing)
Interface: Serial via SIM interface
Connectors: BNC (4 front, 2 rear); DB15 (male) SIM interface
Power: Power supplied by the SIM900 Mainframe, or optionally by a user-supplied DC power supply (+5 V)
Dimensions: 3.0" × 3.6" × 7.0" (WHL)
Weight: 2.3 lbs.
