the mA-S1 lead will be at a negative potential with respect to
the common connection. The potential across the unknown
resistance is -1 V per 1000 counts on the 10 kS1 th rough
10 MS1 ranges, and -0.1 V per 1000 counts on the 1 kS1
range.
When making voltage measurements, the mA-S1 input jack
is connected to common; therefore, any voltage applied to
the mA-S1 input jack may blow the internal protection fuse.
See Current (mA) Input Fuse Replacement for instructions.
RMS Considerations
When making rms voltage measurements, the composition
of the signal and the type of input coupling must be consi
dered. For current measurements, the input is always de
coupled. The input voltage signal may be ac only (average
value is zero) or a composite of ac and de, in which case,
the type of input coupling selected will affect the reading.
If the input voltage signal is ac only (average value is zero),
either the AC or DC position of the INPUT COUPLING
switch may be used.
If the input voltage signal is ac and de (average value is not
zero), two different rms values are possible. With the IN
PUT COUPLING switch in the AC position, the de (or
average value) is blocked and the reading is the rms value
of the ac portion of the signal. In the DC position of the
INPUT COUPLING switch, the reading is the rms value of
the combined ac and de signal.
Unknown Voltage and Current Measurements
With DMM
When making unknown voltage and current measurements
with the digital multimeter, always set the VOL TS-mA/DIV
control on the highest range before attaching the probe or
mA-S1 test lead. Then decrease the range until overrange
occurs (scrambled character segments or S's) and then in
crease the range one step.
PROCEDURES
Peak-to-Peak AC Voltage
The oscilloscope is used to measure peak-to-peak ac voltages
or the voltage between any two points on a waveform.
If the amplitude measurement is critical or the trace is thick
as a result of noise, hum, etc. on the signal, measure from
the peak of the signal to the valley. This method subtracts
the trace thickness from the measurement.
Make sure the VOL TS-mA/DIV VAR control is in the cali
brated detent. Vertically position the display so the lower
@
213 Operators
19
Summary of Contents for 200 Series
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