Tektronix 1685 User manual

Model 1685 Clamp-on AC Current Probe

Instruction Sheet

Specifications

Ranges: 3 ranges, switch selectable 2A, ZOA, and 200A.
Switck: 30’ throw, increasing ranges with CW rotation.

Accuracy: i4% of range at 60Hz with conductor centered in jaws on 2A range. zk3% of range at 60Hz with conductor
centered in jaws on 20A and ZOOA range.

Transfer Function: O.lV per ampere into 1MR load.
Temperature Coefficient: M.l5%PC of range from 15’C to 35’C on 2A range. M.25%PC of range from 15’C to

35°C on 20A and 200A range.
Maximum Current: 300A.
Maximum Voltage on Measured Conductor: 600V rms, 60Hz.
Weight: 12 ounces.
Supplied Accessories: 10 ft. set of cables terminated with banana plugs, and Operator’s Manual.

WARNING

Carelessness and misuse of this instrument can be dangerous. Before connecting this instru­ment, carefully read instructions and precautions. Failure to follow instructions can result in a
serious or fatal injury.

Do not use this instrument if it is damaged, contaminated, deteriorated, moist or has missing
parts.

Do not open this case. No user serviceable parts inside. Refer servicing to qualified personnel
only.

Operation Instructions

1. Connect the supplied set of test cables to the Model 1685 Probe housing.

2. Set the RANGE dial on the Model 1685 to 200A range or lower range if the current to be measured is known.
For rated accuracy, the

3. Connect the test cable from the Model 1685 to the Voltmeter input (HI and LO) terminals.

4. Set the voltmeter to “AC” and the 1OV range (or autorange if available).

Do not use where voltage exceeds 600V AC 60Hz with respect to ground.

Maximum allowable current is 300A rms. If this current is exceeded damage to the probe (not
covered by the warranty) may occur.

current should be greater than 10% of Model 1685 range setting.

WARNING

CAUTION

28070 Rev. D I

11-83

5. Turn off power to the conductor to be measured (if possible).

6. Squeeze the probe to open the jaws of the clamp. Position the probe so that the conductor is centered within the
probe as shown.

NOTE

Since the probe detects current by sensing the magnetic field set-up by,the AC current, only one
conductor can be measured. If two conductors are placed within the jaws of the probe, the net mag­netic field will be zero. Therefore, a power cord, such as attached to an appliance, motor, or other
device, must be split into separate conductors so that the jaws of the probe can surround only one
of the two conductors.

7. Apply power to the conductor and record the AC voltage measured by the voltmeter. The probe output is 9.1V
AC rms per ampere.

For example:
O.lV AC rms corresponds to 1AAC rrns.

l.OV AC rms corresponds to 1OAAC rms.
lO.OV AC rms corresponds to 1OOAAC rms.