SRS SIM970 Multi Channel Digital Voltmeter
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- 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
Lambda Exclusive Promotion:
Additional 12 months warranty for free (2 years total) via our UK Service Centre.
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- One count is a unit change in the least-significant digit. 7 ½ digits of resolution available through the remote interface
- Measured over 360 consecutive readings
- Inside SIM900 mainframe following a two hour warmup, autozero ON
- Scale calibration ON
- Within 10 minutes and ±0.5 °C, within ±10 % of the initial value, fixed range, input between 10 % and 100 % of full scale
- Input bias current is <1 pA at 23 °C
- Internal triggering, autozero ON. Rate is double for autozero OFF
| 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 |
| 3 | 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 |
Stanford Research Systems SIM970 datasheet 
