doepfer
System A - 100
1. Introduction
Analog Meter
A-197
A-197
In
Neg. Indicator
VU Meter
Met er
Meas . Mode
Module A-197 serves to display DC or AC voltages
by means of an illuminated moving coil meter with
mirror scale.
The display range is 0...+10V (resp. -5V...+5V in the
offset mode).
The module features 3 different measuring methods
that are selected by a toggle switch.
A LED is used as an indicator for negative voltages.
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A-197
Analog Meter
System A - 100
doepfer
2. Overview
➊
Controls:
1 Meter : Moving coil meter
2 Meas. Mode : Measurment mode switch
3 LED : Indicator for negative voltages at
input !
➀
Inputs / Outputs:
! In : Measuring voltage input
(3-fold multiple)
➁
➂
2
doepfer
System A - 100
Analog Meter
A-197
3. Controls
1 Meter
The illuminated moving coil meter with mirror scale is
used as readout for the voltage applied to socket !.
2 Measurement Mode
This switch is used to select the desired measurment
mode:
• Full wave rectifier
In this mode the incoming signal is rectified and
smoothed with a low pass filter.
This mode is normally used to display audio signals resp. AC voltages. But even DC voltages
can be measured in this mode. The display shows
however the absolute value (i.e. positive voltages
remain unchanged, negative voltages - e.g. -3V are converted into the corresponding positive voltages - e.g. +3V). To distinguish between positive
and negative input signals LED 3 is available that
lights up in case of a negative signal.
• Direct mode
In this mode the incoming voltage is lead to the
meter without additional electronic modifica-
tion.
This mode is intended to display positive DC
voltages, e.g. ADSR (A-140/141/A142), MIDI-toCV (A-190/191), positive analog or digital random
voltages (A-149-1, A-149-2), foot controller (A-177)
or slowly changing Gate/Clock signals.
• Offset mode (+5V Offset):
In this mode +5V are added to incoming voltage
before it reaches the meter. Zero volt input correspond to the middle position of the display
needle (i.e. +5V read out).
This mode can be used to display positive and
negative voltages, e.g. a slowly swinging LFO
(A-145/146/147), S&H (A-148), bipolar random voltages (A-118), joy stick (A-174), Theremin (A-178),
light controlled CV source (A-179).
3
A-197
Analog Meter
System A - 100
doepfer
3 Neg. Indicator
The LED lights up if a negative voltage appears at the
measurement input !.
4. Inputs / Outputs
! In
This socket is the measurement input of the module. It
is available as a triple multiple so that the signal to be
measured can be used elsewhere in the system simultaneously.
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