Amprobe VPC-30 VPC-31 Voltage-Continuity - Manual (Page 10)

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OPERATION
Note: All function operations described hereafter are via the stationary “Red”
probe for positive (+) polarity and the detachable “Black” probe for Ground
reference (-), or otherwise specified
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WARNING!
• Accurate indication is assured only when use within the specified
operating temperature range.
• Before using the Audible Continuity & EF-Detection features at
locations with a high background noise level, it shall be determined
whether the audible signal is perceptible. The audible indication is for
information only; do not rely on it, especially in high background noise.
• The functioning of the tester shall be checked shortly before and after
a test. If indication of one or more steps fails, or if no functioning is
indicated, the tester shall no longer be used.
Indicator Self-Test
Short the two test probes together, the tester enters continuity function. The
continuity LED will turn on and the beeper will sound. With the probes still
shorted, press the EF button momentarily. The LEDs will illuminate for full
indication check. Five voltage indicating bi-color LEDs will change from green
to red. On the VPC-31, the LCD will turn on for full segment check. The
, +L,
-L and K LEDs flash twice additionally when the battery voltage is low. After
the Self-test is finished in approximately 2 to 3 seconds, the tester resumes
normal functions.
ACV (K) and DCV (L) measurements
Perform Indicator Self-Test as described. Test the tester on a known
functioning circuit or component before and after performing measurements.
Connect test probes to voltage source and observe indication, as shown in
Fig.1. Do not cover indicating LEDs (and also LCD on VPC-31) and do not
touch the contact electrode before and during the tests. The tester turns on
automatically at threshold voltages as specified in the specification section.
When significant ACV is being tested, KLED turns on. When significant DCV is
being tested, +LLED turns on for correct test probes polarity, and -L LED turns
on for reversed polarity. Significant voltage levels are indicated as a series of
LEDs in an auto-ranging manner. No manual-ranging selection is required.
VPC-31 also indicates voltage levels on the automatic back lighted LCD.