The Model 197 is a six function, 5?h digit resolution
autoranging digital multimeter with a +-220,000 count LCD
(Liquid Crystal Display). This A/D range is greater than the
normal +-199,999 count A/D used in many 5?h digit DMMs.
The 5% digit resolution allows the Model 197 to measure DC
voltage from 1pV/count to 1OOOV. AC voltage and current
measurements are standard in the Model 197. TRMS ACV
capability ranges from IpVlcount to 750V. The Model 197
measures resistance from 1mQ to 220MQ on seven resistance
ranges. The Model 197 has six current ranges that measure
current from 1nA (lO-9A) to 10A.
The dB function makes it possible to compress a large range
of readings into a much smaller scope. The Model 197 dBm
measurements are referenced to the standard 600Q impedance
but can be modified with the use of relative (REL) feature.
The Model 197 has two IEEE-488 interface options: The
Model 1972 and the Model 1973. These optional interfaces
enhance the capabilties of the Model 197 by allowing programmed
control over the IEEE-488 bus. The Model 1972 also
includes an analog output. The bus commands are the same
for each interface and respond to IEEE-488 protocol.