27
h. Measuring Frequency
CAUTION!
Do not attempt to make frequency measurements with
test leads. The 296 measures the frequency by clamp-
ing the jaw around one conductor (wire). Clamping
around more than one wire will result in erroneous
readings.
Instrument set-up:
FUNC
BLACK RED
MIN
MAX
TEST LEAD TEST LEAD
READING
READING
FREQ
NOT USED NOT USED
0.5Hz
10KHz
Measurement Procedure:
1.
Disconnect power to circuit to be measured.
2.
Set the rotary switch to the
FREQ
function.
3.
Clamp the jaws around one conductor of the circuit
to be measured.
4.
Reconnect power to circuit to be measured.
5.
Read the frequency on the 296.
Note:
The current of the frequency being measured is
displayed on the bar graph.
Optional Modes:
•
HOLD:
Freezes the reading on the LCD.
•
RANGE:
Manually ranges the instrument.
8
2. Product Applications
Perform the following tests and/or measurements with
the 296 and the appropriate function:
HVAC/R
ACA
• Heat anticipator current in thermostats.
ACV
• Line voltage.
ACV or DCV
• Control circuit voltage.
OHMS
• Heating element resistance (continuity).
OHMS
• Compressor winding resistance.
OHMS
• Contactor and relay coil resistance.
ACA
• Motor and compressor start up current.
OHMS
• Continuity of wiring.
Hz/FREQ
• Frequency on control and line voltages.
REC
• Record min/max voltage of controls
and line voltages.
ALL
• Bar graph to indicate rapid fluctuations.
ELECTRICAL
ACV
• Measure line voltage.
ACA
• Measure line current.
OHMS
• Continuity of circuit breakers.
DCV
• Voltage of direct drive DC motors.
DCA
• Current of direct drive DC motors.
ACA
• Start up current of motors, relays,
contactors and transformers.
ALL
• Harmonics detection on line voltages.
ELECTRONIC
ACV
• Measure power supply voltage.
ACA
• Measure power supply current.
OHMS
• Continuity of circuit breakers and fuses.
