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OPERATION
MODEL 169
WARNING
To avoid electrical shock and/or instru
ment damage, do not connect the LO input
to
any
source
of more than 1400
volts
(peak) above earth ground.
2-14.
Tilt Bail/Handle.
2-18.
OPERATING INSTRUCTIONS.
2-19.
The basic operating instructions for the
Model 169 DMM are outlined below. In addition,
there are individual instructions provided in this
section which describe how to make specific function
measurements. Refer to Figure 2-3 and operate the
DMM as follows.
A
CAUTION
2-15.
The 16 position tilt bail/handle allows you
to position the instrument for the best
viewing
angle of the display.
Do not exceed the maximum input limits
given in Table 2-2.
2-16.
INITIAL FUNCTIONAL CHECK.
2-17.
Now that the batteries are installed and you
have become familiar with your DMM, the initial
checkout procedure given in Table 2-1 should be per
formed.
This procedure provides a quick and easy
functional check of the DMM.
Only test leads are
required.
The check is designed to cause all annun
ciators to appear, except for low battery (BAT).
All decimal point locations are checked.
All digit
segments are checked, except for the horizontal cen
ter segment on the last three digits.
Since the
minus sign (-) is not suppressed on any function, it
should
periodically flash on one or more of the
functions
at zero
with
the
input
shorted.
By
selecting two functions and/or ranges in the test,
the current fuse is checked and a rough indication
of the condition of the respective current shunt and
range resistor is obtained.
However, this test is
not intended to check the DMM accuracy, and thus,
the indicated readings in the table are nominal with
±5 digits allowed.
If it is desired to check the
DMM accuracy specifications, perform the Performance
Verification, Section 3.
The Initial
Functional
Check is begun with power on and all other push
buttons out.
To obtain this condition it may be
necessary to press unselected function and
range
pushbuttons slightly to cancel previous selections.
After completing the functional check, operate the
Model 169 in accordance with the Operating Instruc
tions beginning with Paragraph 2-18.
a.
Turn on power by depressing the ON/OFF push
button.
If the instrument is within 18-28°C, it is
useable immediately to rated accuracy.
If the
ambient temperature is within 18-28°C range, but the
DMM has been subjected to temperature extremes, up
to 1 hour may be required to obtain rated accuracy.
b. Select the function with the AC/DC, V, A or n
pushbuttons.
c. Select the range by depressing the appropriate
range pushbutton.
d. Connect the source to the INPUT jacks and make
the measurement.
Accessories described in Section 4
should be used as required.
TABLE 2-2
Summary of Maximum Inputs
FUNCTION
RANGE
MAXIMUM
INPUT
DCV
ALL
lOOOV DC, 1400V Peak AC
ACV
200mV
350V rms continuous, 15
sec. maximum above 350V
2V-1000V
lOOOV rms, 1400 peak,
lOSvHz
ACA, OCA
ALL
2A, 250V DC or rms (fuse
protected)
n
ALL
300V DC or rms
2-4
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