IBM Car Amplifier 7220 Manual do Utilizador descarregar pdf (Página 90)

6-14

Chapter 6, COMPUTER OPERATION

FRQ[.] Reference frequency meter

If the lock-in amplifier is in the EXT or EXT LOGIC reference source modes, the

FRQ command causes the lock-in amplifier to respond with 0 if the reference channel

is unlocked, or with the reference input frequency if it is locked.

If the lock-in amplifier is in the INT reference source mode, it responds with the

frequency of the internal oscillator.

In fixed point mode the frequency is in mHz.

In floating point mode the frequency is in Hz.

LOCK System lock control

Updates all frequency dependent gain and phase correction parameters.

6.4.03 Signal Channel Output Filters

SLOPE [n] Output low-pass filter slope (roll-off) control

The value of n sets the slope of the output filters according to the following table:

n Slope

0 6 dB/octave

1 12 dB/octave

2 18 dB/octave

3 24 dB/octave

TC [n]

TC. Filter time constant control

The value of n sets the time constant of the output according to the following table:

n time constant

0 10 µs

1 20 µs

2 40 µs

3 80 µs

4 160 µs

5 320 µs

6 640 µs

75 ms

8 10 ms

9 20 ms

10 50 ms

11 100 ms

12 200 ms

13 500 ms

14 1 s

15 2 s

16 5 s

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 154 155

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IBM Car Amplifier 7220 Manual do Utilizador Página 90