Input signal channel

InputSensitivity
Input Impedance
Frequency
Maximum Inputs
Gain Accuracy
Gain Stability
Dynamic Reserve

High or low impedance differential or single ended via front panel BNC
3§Å to 1V (for 1V output) switched in 1, 3, 10 steps
1012¥Ø  1nF, dc coupled
10Hz to 100kHz
±6V before input protection circuitry comes into operation.
1%
200ppm/¡É60dB

Demodulator

The output of the signal input stage is processed using a very high bandwidth demodulator to recover the input signal.
Offsets introduced at this stage are automatically removed via novel feedback mechanisms.

Low pass filter

The output from the demodulator is passed through a first order low pass filter and then amplified before output via a front panel BNC.

Time Constant
Output
Offset

100§Á to 30s in 1, 3, 10 steps
±1V output corresponds to full scale Input. Short circuit protection included.
Up to 1x full scale, switchable on or off.

Reference channel

The reference input circuitry uses a phase locked loop to lock on to a range of signals, such as TTL pulses or sinusoidal waveforms. A phase shifting circuit allows the reference signal to be moved with relation to the signal input. signals at both the reference frequency and twice the reference frequency can be monitored.

Frequency
Input Impedance
Trigger
    Sine
    Pulse
Acquisition time
Phase control
Phase Drift

10Hz to 100kHz
5.6M¥Ø ac coupled

100mV rms min(15V max.)
5V, 95% mark/space ratio min.
10s max.
90¢ªsteps + fine shift in range 0¢ª- 100?
0.1¢ª/¡É