This model consists of two A.C. ammeters and one A.C. voltmeter which can be used to make electrical measurements in general laboratory applications. The voltmeter is accurate within +3% of full scale deflection while the ammeters are accurate within +2% of full scale deflection.

The voltmeter consists of a scale, a toggle switch, and two terminals. The scale has two ranges: 0 to 150 volts and 0 to 300 volts. The toggle switch has two positions: 150V and 300V, and is used to select the voltage range of the scale. The two terminals are for the lead connections. One is marked “+” and is light blue, and the other terminal is yellow.

The ammeters consists of a scale, a range (selector) knob, a reset switch, and two terminals. The scale has two ranges: 0 to 0.5 Amps and 0 to 2 amps. The reset switch is used to reset the meter in the event of overload. IF AN OVERLOAD OCCURS, SEEK THE ASSISTANCE OF THE LAB SUPERVISOR, BEFORE YOU PROCEED. The range (selector) knob has 4 settings: 5A, 2A, 4A, and 8A and is used to select the current range of the meter’s scale. There are two terminals; one is marked “+” and is dark blue and the other terminal is orange.

A.C. Meters Model ACVA-100

A.C. Meters Model ACVA-100

CAUTION:

Before touching the supply or making any connections, make sure that the “MAIN A.C. CIRCUIT” breaker, located on the A.C. power supply panel, is OFF. Also make sure BOTH breakers for BOTH supplies (marked “PRI.” and “SEC.” are OFF.

Select the power supply appropriate for the experiment.

  1. Connect the “positive” line of the circuit or device to the red pin jack and the negative line to the black pin jack of the supply selected, using the proper leads.
  2. Connect a voltmeter across the supply, i.e., positive terminal of voltmeter to the red pin jack and the negative terminal to the black pin jack (both connections will be “piggy-backed” on the connections made in step 2).
  3. Make sure the voltage control knob of the supply is set to zero.
  4. “Turn on” the MAIN A.C. breaker. Next turn on the PRI. breaker then the SEC. breaker of the supply.
  5. Turn the voltage control knob to obtain the desired voltage.
  6. If the supply is overloaded, one or both breakers of the supply should “trip” resulting in a cut-off of power. If this occurs, turn the voltage control knob fully counter-clockwise, set both breakers (PRI. and SEC.) to OFF and set the MAIN A.C. breaker to OFF. Contact your Lab Supervisor to determine the cause of the overload BEFORE YOU PROCEED.