Quad Digital Voltmeter SIM970 — 5?-digit voltmeter (4 ch.)_SIM自组合测试系统_小型化仪器模组_电子仪器

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Quad Digital Voltmeter SIM970 — 5?-digit voltmeter (4 ch.)
: 商品货号：ECS000310; 商品品牌：SRS

Quad Digital Voltmeter SIM970 — 5?-digit voltmeter (4 ch.)

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详细介绍

True 5½-digit performance
Four isolated channels
Bright 7-segment LED displays
Three decade autoranging to ±19.9999 V
10 MΩ input impedance
External trigger for data synchronization
Unique continuous autocalibration
90 dB power line frequency rejection

SIM970 Front Panel

SIM970 Rear Panel

The SIM970 Quad Digital Voltmeter is designed to make precision DC voltage measurements with excellent long-term accuracy.

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 (logic 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.

SIM900 Mainframe

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. All channels are isolated from ground, and from each other. The SIM970 uses isolated BNC connectors for inputs so coaxial cables can be used for reduced noise pickup.

Specifications
Number of channels	4
Number of digits	5½ (±199999 counts)^{[ 1 ]}
Full-scale DC voltage ranges
	Range1 2 3 4	Voltage±19.9999 V ±1.99999 V ±999.99 mV ±199.999 mV	Resolution100 µV 10 µV 10 µV 1 µV	Noise, counts rms ^{[ 1, 2 ]}1.0 0.6 0.6 1.0
Measurement accuracy, ±(% of reading + counts) ^{[ 3 ]}
	Range 1^{[ 4 ]}2 3 4	24 Hrs., (23 ± 1) °C0.0004 + 1.5 0.0004 + 2.0 0.0004 + 2.0 0.0004 + 4.0	90 day, (23 ± 5) °C (typ.)0.0050 + 1.5 0.0050 + 2.0 0.0050 + 2.0 0.0050 + 6.0	1 year, (23 ± 5) °C (typ.)0.0080 + 1.5 0.0080 + 2.0 0.0080 + 2.0 0.0080 + 6.0
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 frequency^{[ 7 ]}	3.6/s (60 Hz), 3.0/s (50 Hz)
Normal mode rejection at line frequency	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.
Warranty	One year parts and labor on defects in materials and workmanship

NOTES[ 1 ] One count is a unit change in the least-significant digit. Greater resolution is 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

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