ENDEVCO 6634C
INSTRUCTION MANUAL
IM6634C
Page 3-3
A.
INPUT TYPE
Pressing TYPE in the Normal Mode will cause the Digital Readout indicator to flash the present input type setting of
the 6634C. The indicator will flash the following codes for each input setting:
SEPE
single-ended Piezoelectric (PE) transducer
DIFF
differential PE transducer
VEL
velocity coil, DRCC (velocity output)
IEPE
RCC input (optional) DRCC acceleration output
CAUTION: Damage may result if the PE and ISOTRON units are not isolated to prevent potential ground
loops. Differential units are not affected.
While the INPUT TYPE is being indicated, the ALARM and OUTPUT displays are off.
To change the present setting, press TYPE again. The display will scroll to another input choice each time TYPE is
pressed. When the desired choice is displayed, press ENTER. The new input choice is implemented, and the unit
returns to Normal Mode. The unit automatically returns to Normal Mode if no key is pressed for about 20 seconds.
The new input choice is stored as the default in non-volatile memory.
Switching between Velocity Coil and RCC input types is accomplished by moving internal jumpers on W1 and W8.
W9 is used to enable DRCC software. Figure 2-4 shows the correct jumper setting for each type of input.
B.
INPUT SENSITIVITY
Pressing SENS in the Normal Mode will cause the Digital Readout Indicator to flash the present sensitivity setting of
the 6634C. The indicator will flash the sensitivity setting with the appropriate units for the selected input type, as
follows:
pC/g
Single-ended or Differential PE
mV/ips velocity coil or DRCC, VEL OUT
mV/g
RCC input or DRCC, ACC OUT
While the INPUT SENSITIVITY is being indicated, the ALARM and OUTPUT displays are off.
To change the present setting, type in the desired sensitivity using the numeric keys. The display will flash the
numbers entered. If an illegal value is entered, the display flashes ERR1, indicating that an allowable value should
be reentered. When the desired entry is displayed, press ENTER. The new sensitivity is implemented, and the unit
returns to Normal Mode. The unit automatically returns to Normal Mode if no key is pressed for about 20 seconds.
Different sensitivities can be selected for each input type. The new sensitivity settings are stored as the defaults for
selected input type in non-volatile memory.
NOTE:
When using the DRCC acceleration output, the sensitivity of the transducer is multiplied by the gain of
the DRCC and the product is divided by 10. The sensitivity of the 6634C should be set a factor of 10 lower than the
transducer sensitivity times the DRCC gain.
SENS = ( SENS x DRCC GAIN )/ 10
The allowable sensitivity ranges are as follows:
PE (single-ended or differential)
1.500 to 150.0 pC/g
Velocity Coil
15.00 to 1500 mV/ips
RCC Input
1.500 to 150.0 mV/g