Characterisation, Measurement & Analysis
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SRS SIM970 Multi Channel Digital Voltmeter

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Product Code: 15032
Manufacturer: Stanford Research Systems

  • True 5½-digit performance

  • Four isolated channels

  • Bright 7-segment LED displays

  • Three decade autoranging to ±19.9999 V

  • 10 MW input impedance

  • External trigger for data synchronization

  • Unique continuous autocalibration

  • 90 dB power line frequency rejection


The Stanford Research Systems SIM970 Quad Digital Voltmeter is designed to make precision low-frequency voltage measurements with excellent long-term accuracy. A single SIM970 module delivers big DVM performance at a very economical cost per channel.

For applications in which many voltages must be monitored, up to 16 DVM channels can be put into one SIM900 mainframe. Four voltage ranges from ±199.999 mV to ±19.9999 V can be autoranged or manually selected. An external trigger input allows synchronization of voltage readings on all four channels for critical applications requiring coincidental readings. A BUSY output gives a TTL HIGH when readings are being taken.

Autocalibration is performed with every reading by sequentially measuring not only the input voltage, but also the ground and the full-scale voltages against a calibrated internal reference. This autocalibration routine virtually eliminates offsets and scale errors, and ensures smooth range-to-range transitions.

The bright front panel LED display shows updated readings three times per second. Computer access through the SIM900 mainframe (RS-232 or GPIB) permits data logging with 24 bits of resolution. The SIM970 uses isolated BNC connectors for inputs so coaxial cables can be used for reduced noise pickup.

NOTES
  1. One count is a unit change in the least-significant digit. 7 ½ digits of resolution available through the remote interface
  2. Measured over 360 consecutive readings
  3. Inside SIM900 mainframe following a two hour warmup, autozero ON
  4. Scale calibration ON
  5. Within 10 minutes and ±0.5 °C, within ±10 % of the initial value, fixed range, input between 10 % and 100 % of full scale
  6. Input bias current is <1 pA at 23 °C
  7. Internal triggering, autozero ON. Rate is double for autozero OFF

Additional Information

Full-scale DC voltage ranges        
Range   Voltage  Resolution  Noise, counts rms [1,2]
1   ±19.9999 V  100 μV 1.0
2   ±1.99999 V 10 μV  0.6
3   ±999.99 mV 10 μV  0.6
4   ±199.999 mV 1 μV  1.0
Measurement accuracy, ±(% of reading + counts) [3]      
Range   24 hour, (23 ± 1) °C 90 day, (23 ± 5) °C (typ.)  1 year, (23 ± 5) °C (typ.)
1 [4]   0.0004 + 1 0.0050 + 1  0.0080 + 1
2   0.0004 + 2 0.0050 + 2  0.0080 + 2
0.0004 + 2   0.0050 + 2 0.0080 + 2
4  0.0004 + 4   0.0050 + 6 0.0080 + 6

 

Number of channels 4
Number of digits 5½ (±199999 counts) [1]
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 at line freq. [7] 3.6/s (60 Hz), 3.0/s (50 Hz)
Normal mode rejection at line freq. 90 dB (59 to 61 Hz or 49 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 LEDs for range and autorange indication.
Operating temp. 0 °C to 40 °C, non-condensing
Interface Serial via SIM interface
Connectors BNC (4 front, 2 rear) DB15/M SIM interface
Power +5 V (480 mA)
Dimensions 3.0" × 3.6" × 7.0" (WHD)
Weight 2.3 lbs
Warranty One year parts and labour on defects in materials and workmanship

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