AMALGAMATED INSTRUMENT LD5-TMR, Operation And Instruction Manual, Page: 40 / 57

5.25 Inputs 1 and 2 bias
Section:
IN 1
to
IN 2
Display:
bIAS
Range:
OFF
,
On
Default Value:
On
Default Access Level
4
Function number
4C02
to
4C03
Allows electrical input bias setting of inputs 1 and 2. When set to
On
an input bias voltage will be applied to the
input circuit. When set to
OFF
no bias voltage will be applied to the input circuit. This function should be set to
On
when the input signal does not go below 0V. See “Electrical Installation” chapter for further information.
5.26 Inputs 1 and 2 low frequency
Section:
IN 1
to
IN 2
Display:
Lo F
Range:
OFF
,
On
Default Value:
OFF
Default Access Level
4
Function number
4C04
to
4C05
Allows application of a low pass filter setting for inputs 1 and 2. When set to
On
an low pass filter will be applied
to the input circuit. When set to
OFF
no low pass filter will be applied to the input circuit. This function should be
set to
On
for inputs likely to generate contact bounce such as switch and relay inputs but it can also be useful for
blocking higher frequency signals when only low frequency inputs are being used. The filter will only allow signals
of approx. 80Hz or lower to pass to the input stage. See “Electrical Installation” chapter for further information.
5.27 Inputs 1 and 2 hysteresis
Section:
IN 1
to
IN 2
Display:
HYSt
Range:
OFF
,
On
Default Value:
OFF
Default Access Level
4
Function number
4C06
to
4C07
Allows application “hysteresis” setting for inputs 1 and 2. When set to
OFF
the input gain will be set for signals
of 25mV to 250mV. When set to
On
the input gain will be set for signals above 250mV. When set to
OFF
the
input will accept lower amplitude signals but will also be more likely to pick up electrical noise. See “Electrical
Installation” chapter for further information.
5.28 Inputs 1 and 2 attenuation
Section:
IN 1
to
IN 2
Display:
Attn
Range:
OFF
,
On
Default Value:
OFF
Default Access Level
4
Function number
4C08
to
4C09
Allows application of a 5 times attenuation for inputs 1 and 2. When set to
OFF
no attenuation will be applied.
When set to
On
the input signal will be reduced by a factor of 5 before moving on to the first amplification stage.
Applying attenuation can be used to reduce the noise level of the input signal when the input signal itself is large
40 of 57 LD5TMRMAN-1.1-0