Ametek 7280 Instruction Manual page 151

FASTMODE [n] Analog Output Mode Control
The value of n sets the fast analog output mode control according to the following
table:
n Function
0 Fast mode off
1 Fast mode on
When the fast analog output mode is turned on, the available settings for the
CH1/CH2 analog output controls are restricted, and hence affect the allowable
parameter range for CH1 and CH2 commands. It also restricts the available range of
output filter slope settings, limits the full-scale sensitivity to a maximum of 100 µV
and restricts the range of AC Gain settings if the AC Gain Automatic control is
turned off. The effect is that the instrument's dynamic reserve is limited to a
maximum value of 15 dB.
When fast mode is turned off, the output filter time constant is restricted to values of
500 µs and longer, but the other restrictions on output filter slope, sensitivity and AC
gain are removed.
CH n [n ] Analog output control
1 2
Defines what outputs appear on the CH1 and CH2 connectors on the rear panel.
When the fast analog output mode is turned off (FASTMODE 0), the selection is
according to the following table:
n Signal
2
0 X % (2.5 V FS)
1 Y % (2.5 V FS)
2 Magnitude % (2.5 V FS)
3 Phase 1: +9 V = +180°, -9 V = -180°
4 Phase 2: +9 V = 360°, - 9 V = 0°
5 Noise % (2.5 V FS)
6 Ratio: (10 × X%/ADC 1)
7 Log Ratio: log
8 Equation 1
9 Equation 2
Dual modes only:-
10 X2 % (2.5 V FS)
11 Y2 % (2.5 V FS)
12 Magnitude2 %FS
13 Phase2 1: +9 V = +180°, -9 V = -180°
14 Phase2 2: +9 V = 360°, -9 V = 0°
n is compulsory and is either 1 for CH1 or 2 for CH2
1
Note: n = 5 is only permitted if the noise measurement mode is on
2
(NOISEMODE 1) or if the present settings of output filter slope and time constant
are within the permitted range and the synchronous time constant control is off.
When the fast analog output mode is turned on (FASTMODE 1) and the instrument
(10 × X%/ADC1)
10
Chapter 6, COMPUTER OPERATION
6-17