Equipment information

Thandar TG 102 Generator
Model TG 102
Category: Measurement instruments
Group Generator
Description Function Generator
                                    The relationships between the major circuit elements are
shown in the block diagram opposite.

The summing amplifier sums the voltages from the dial and
from the sweep input, and its output controls the magnitude
of the complementary current source and current sink. This
current varies from approximately 5pA to 5mA for a 1000:1
frequency change (.002 - 2.0).
The diode gate steers current into or out of the range
multiplier capacitor and is controlled by the comparator
output. When the comparator output is high the charge on the
capacitor will rise, linearly, producing the positive going
triangle slope. When the comparator output is low the charge
on the capacitor will fall linearly producing the negative
going triangle slope.

The triangle amplifier has unity gain and buffers the
triangle wave on the multiplier capacitor to drive the
comparator and output circuits.

The comparator operates as a window detector with fixed
limit points set to the triangle peaks. One of its two
outputs drives the TTL circuit and is also level shifted to
drive the diode gate. The other output drives the squarewave
shaper. When the comparator output to the diode gate is high
the triangle wave is positive going until this reaches
approximately +1V, the comparator output then switches low.
When the comparator output is low the triangle wave is
negative going until this reaches approximately — 1V, when
the comparator output goes high, and the cycle is repeated.
This basic function generator loop is shown by the double
arrows in the block diagram. Triangle and squarewave are
generated simultaneously as shown.

To achieve the 10Hz range, the current steered by the diode
gate is divided by 10 and the same capacitor is used as on
the 100Hz range.

The TTL circuit buffers one of the comparator outputs to
drive the TTL output socket.

The square shaper converts the comparator output to a
current signal and applies it to the square wave function
switch. The sinewave converter uses the non-linear
characteristics of its diodes to convert the triangle wave
into a sinusoidal current, which is applied to the sinewave
function switch. The selected function is sent to the
pre-amplifier, where it is inverted and buffered and applied
to the output level control. The signal is summed with the
voltage from the DC offset control at the output amplifier.
This amplifier inverts and amplifies the signal up to 20V
peak-peak to drive the 50Q output connector.

These manuals are available for the above equipment:

Manual Type Service Manual Thandar-9573-Manual-Page-1-Picture
Pages 23
Size 5.64 Mbytes (5913813 Bytes)
Language english
Quality Scanned document, all readable.
Upload date
MD5 449242b9b156f64255ee34a6b492fd17
Downloads 29 since 26 September 2017

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