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BASIC DMM OPERATION
2.6.7 TRMS AC Voltage Measurements
Setiling Time-&c
to within 0.1% of change in reading.
This time specification
does not include A/D conversion
The in.Wument can make TFNS AC voltage mez+rements
from 1pV to 3OOV. To m&Wire AC volts, proceed as follows:
1. Select the AC volts function by pressing the VOLTS and
AC buttons.
2. Select a range consistent
with the expected voltage or
use autorange.
3. Select the front or rear panel input terminals
using the
INPUT switch.
NOTE
Caution :
There is a small amount of offset (typicaUy 150
Maximum input = 300V RMS. 425V Peak, 1 d V. Hz
counts at 5*/zd) present
when
using. the ACV
Input Impedance = 1 MR Shunted by < 1 OOpF
time.
AC
Voltage
SOWX
MODEL
199
function.
Do n&zero
this level o&Paragraph
2.610
provides
an explanation
of AC voltage
offset.
Figure 2-6. TRMS AC Voltage Measurement
4. Con&a
the signal to be measured
to the selected in-
put terminals
as shown in Figure 2-6.
2.6.8 Current Measurements
(DC or TRMS AC)
5. Take the reading from the display.
The Model
199 can make
DC or TRMS
AC current
Clarifications
of TRMS ACV Specificatioik
measurements
from lOOn.4 (at Wtd resolution)
to 3A. Use
the following procedure
to make current measurements.
Maximum
AIlowable
Input-The
following
graph sum-
ma&es
the
maximum
input
based
on the
lOY*Hz
1. Select the DC current or AC -nt
'Kiticfion by prrssing
specification.
the AMPS button (also press AC for AC current).
2. Select a range consistent
with the expected current or
use autorange.
Maximum
Input
TRMS
AC Volts
3. Connect
the signal to be measured
to the front-panel
input
terminals
as shown
in Figure
2-7.
4. Take the reading from the display.
Maximum Input TRMS AC Volts
MODEL
199
Front Panel
Caution ; Maximum Continuous input = 3A
Figure 2-7. Current Measurements
2-12
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