22
PRS-812 Resistance Meter
c. Once the instrument confirms a stable measurement, if any,
HOLD
will be displayed in
the LCD and the electrification timer will stop. If a stable measurement cannot be
obtained at this range
OL
will be displayed.
E. Resistance Measurements in MANUAL Modes of Operation
To select MANUAL in either, Exponential (Mode 3) or Ohms (Mode 4) Display, use the
FUNCTION MODE button to toggle through choices. Manual is used for a variety of
applications where one desires to override Automatic functions:
Measurements where magnitude is in a defined decade and test voltage is fixed.
When an extended electrification period may be desired
Manual selection of test voltage for standards not consistent with Automatic settings
The following summarizes MANUAL Mode Operations and assumes test leads are installed
1. Slide Battery Buss Cut Off switch to ON position
2. Press Red ON/OFF button once to power up the instrument.
3. To select MANUAL MODE press the MODE button until MANUAL appears in the LCD.
a. Press the MODE button 2 times selects MANUAL Exponential display (1.0EXX).
b. Pressing the MODE button three (3) times, selects MANUAL display in Ohms.
4. Set
RESISTANCE RANGE SELECTION
using the UP
and DOWN
arrow keys.
a. Selects Range in one-decade increments as indicated with colored LED’s.
b. For resistance ranges below <E03, use the LCD displayed decimal point (
.
) for
setting the desired decade. The
<3
LED will be illuminated.
5. Set test voltage by pressing
MANUAL SELECT TEST VOLTS
button until the desired
voltage is displayed in lower portion of LCD, i.e.,
<10
,
10
or
100
V
olts.
MANUAL
Test
Voltage & Resistance Limits are defined below.
IMPORTANT:
Violating these limits may effect measurement accuracy.
<10V
:
0.1 to <1.0x10
4
ohms
(0.1
- < 10K
)
10V:
1.0x10
2
to <1.0x10
9
ohms
(100
- < 1G
)
100V:
1.0x10
5
to 2.0x10
14
ohms
(100K
- 200T
)
6. Press TEST to begin the Measurement Test Cycle.
NOTE:
If a test voltage is
not manually selected
, test voltage control will
default to Automatic Mode limits, switching higher or lower in accordance with
resistance range selection, when the TEST button is pressed.