AC Power Inlet:
The customer connects the power cord to the AC Power Input. As a safety
precaution, the power cord cannot be connected if the fuse compartment is open.
Refer to Section 5.3 for information on fuse replacement.
Fuses:
The fuses are replaceable by removing the fuse cap with a screwdriver. Domestic
models (115V) have
1
⁄
4
x 1
1
⁄
4
” fuse, International models (230V) have two 5 x 20
mm fuses. Be sure to disconnect the power cord before checking or replacing
fuses. See Section 5.3 for fuse specification information.
RS-232 Communication Ports:
The female DP-9 ports allow the customer to make a 3-wire RS-232 interface
with the controller and the reference meter. A detailed description of this part is
described in Section 4.
3.4
Controller Settings
3.4.1
Changing the Temperature Setpoint
Definitions:
Process Variable:
This field displays the current temperature of the target plate.
Setpoint Temperature:
This field displays the desired target plate temperature. Once the target plate
reaches this desired temperature, both displays will read the same value.
Controller Keys:
Parameter/Access Key:
Press to scroll through menu parameters
Raise Key:
In the normal operating mode, press this key to increase the setpoint
temperature. In the programming mode, use this key to increase the menu level
or the value of a selected parameter.
Lower Key:
In the normal operating mode, press this key to decrease the setpoint
temperature. In the programming mode, use this key to decrease the menu level
or the value of a selected parameter.
Mode Key:
Press to save settings and exit a menu level.
The layout of the front panel is shown in Figure 2. The BB705 incorporates a
PID digital temperature controller. In the default mode, the digital displays the
process variable (PV) as well as the setpoint variable (SV). The process variable
in the BB705 is the current measured temperature of the heater cavity. The
Operation
3
3-5