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Section 4
15
Model 9002
Operation from the Front Panel
[all active keys]
This functions key switches programming and display between Channel 1 and Channel 2. The selected channel is
shown by illumination of the CH 1 and CH 2 indicator. CH1/CH2 does not change the configuration of a filter; it only
shows the present configuration for the selected channel.
[active keys: keypad, ENT, ⇑/⇓ , CH1/CH2, CLR DSP FLTR MEM]
This key displays the present filter configuration number 0-7. The MEM indicator light will turn on. A configuration
contains the following combination of user-programmable filter parameter.
Pre- and Post-gain levels
Corner Frequency
Single-ended or Differential input
Filter in-circuit or Bypassed
AC or DC I/O Coupling
The filter configuration number can be changed in the range 0-7 on the numeric keypad or by using the ⇑/⇓ keys. The
Model 9002 will not allow any number over 7 to be entered. The configuration number affects both Channel 1 and Channel
2. The CH1/CH2 key is used to display the configuration number in the selected channel. Thus, Channel 1 cannot be set
to configuration number 0, and Channel 2 simultaneously set to configuration number 5. They will automatically be set to
the same configuration number, although the setup of each configuration may be different for each channel.
Pressing FLTR MEM a second time will return the system to the previous control mode and update the instrument to
the presently selected configuration.
[active keys: CH1/CH2, FLTR TYPE]
Activation of this function causes the display of an alphanumeric, coded description of the type of filter in the selected
channel. The types are selected from those in Table 4.3. The CH1/CH2 key may be used to display the filter type in
the selected channel.
Table 4.3 Electrical Characteristics of Filters
FLTR
MEM
CH1
CH2
FLTR
TYPE
Type Number Characteristic
Lowpass
LP00 8-pole Butterworth
LP01 8-pole, 6-zero elliptic 1.77
LP02 8-pole,Bessel
LP03 8-pole, 6-zero constant delay
LP05 8-pole, 6-zero elliptic (200 kHz)
LP06 4-pole Bessel
LP07 4-pole Butterworth
LP08 8-pole, Bessel (200 kHz)
LP09 8-pole, Butterworth (200 kHz)
LP10 8-pole, 6-zero constant delay (200 kHz)
Highpass
HP00 8-pole Butterworth
HP01 8-pole, 6-zero elliptic1.77
HP05 8-pole, 6-zero elliptic (200 kHz)
HP07 4-pole Butterworth
HP09 8-pole, Butterworth (200 kHz)
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