![]() ![]() Power supplied by the SIM900 Mainframe, or optionally by a user-supplied DC power supply (+5 V) Green LED for range and autorange indication ![]() Red LED, 0.40", with polarity indication. ☖0 V center to shield, ☒00 V shield to earthġ25 dB (for 1 kΩ unbalance in the shield)ġ s to within 3 counts of final reading on ranges 1 to 3, 8 s on range 4 (24 hour counts error)/2 (typ.)ġ0 MΩ ± 1 %, >3 GΩ selectable on ranges 2 to 4 All channels are isolated from ground, and from each other. Computer access through the SIM900 mainframe ( RS-232 or GPIB) permits data logging with 24 bits of resolution. The bright front-panel LED display shows updated readings three times per second. This autocalibration routine virtually eliminates offsets and scale errors, and ensures smooth range-to-range transitions. A BUSY output gives a TTL (logic high) when readings are being taken.Īutocalibration 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. An external trigger input allows synchronization of voltage readings on all four channels for critical applications requiring coincidental readings. Four voltage ranges from ☑99.999 mV to ☑9.9999 V can be autoranged or manually selected. The SIM970 Quad Digital Voltmeter is designed to make precision DC voltage measurements with excellent long-term accuracy.įor applications in which many voltages must be monitored, up to 16 DVM channels can be put into one SIM900 mainframe. ![]()
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