User Manual

Threshold Level to centre position.

Threshold Level to negative pulse position.

Threshold Level to positive pulse position.

These three commands are only included to maintain compatibility with the TF830 and are used to set the

threshold level to one of three ‘preset’ positions available under remote control on that counter. ‘Centre’ is

equivalent to the threshold level control at the midway 'AC' position. ‘Negative pulse’ and ‘positive pulse’

are equivalent to –60mV and +60mV respectively, with AC coupling selected (the only coupling available

on the TF830).

Measurement Commands

M<n>

Sets the measurement time to <n>, where n corresponds to the following:

1 0.3s

2 1s

3 10s

4 100s

The new measurement time is selected immediately and a new measurement is started.

Every Result Query. Measurement results are sent continuously at the interval set for the

measurement time (0.3s, 1s, 10s or 100s). Since these are ‘measurement time’ intervals,

all results will be valid measurements. Stopped by <STOP> or any other command.

Continuous Result Query. Measurement results are sent continuously at the rate at which

the LCD is updated for the selected measurement time – every 2s, 1s, 0.5s or 0.3s for

measurement times of 100s, 10s, 1s or 0.3s respectively. Measurements are sent

whether the <Measure> annunciator was flashing or not, i.e. the measurement may not

be valid. Stopped by <STOP> or any other command.

Next Result Query. The measurement at the next LCD update provided the <Measure>

annunciator is not flashing, i.e. the next valid measurement.

Current Result Query. The measurement at the most recent LCD update whether the

<Measure> annunciator was flashing or not, i.e. the measurement may not be valid.

The format of the response is the same for all forms of the query and is as follows:

NNNNNNN.NNNeSEuu<rmt>

where:

NN.NN is the displayed answer with the decimal point in the corresponding position (11

characters).

e is the letter e for exponent.

S is a plus or minus sign indicating the sign of the exponent.

E is the exponent value to give the answer in Hz or seconds

uu is the units specifier: Hz, s_ , %_ or _ _ ; _ is a space (2 characters)

If there is nothing to measure and the display is zero the response will be:

0000000000.e+0_ _<rmt>

STOP

Stops further measurements being sent in response to E? or C?; any other command will

also stop further measurements being sent, as well as initiating the action of that

command.