Sure, Papst make great fans, but this one has taken a serious beating. And all the dirt inside the heat sink.. Time to bring out the compressor and blow all the dirt away. The original Papst fan still sounds like a jet engine though, it is probably worth looking into a replacement. It is quieter, but does not provide as much airflow. One small problem though: The screws for the old fan they are screwed into threaded holes in the main heat sink are too long.
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Connector plug is removable. Unless otherwise noted, both units will be referred to by the description "dc source" throughout this manual. Page 18 2 — General Information Safety Considerations This dc source is a Safety Class 1 instrument, which means it has a protective earth terminal.
That terminal must be connected to earth ground through a power source equipped with a ground receptacle. Refer to the Safety Summary page at the beginning of this guide for general safety information. Before installation or operation, check the dc source and review this guide for safety warnings and instructions.
It includes a dc source, which produces dc output with programmable voltage and current amplitude, and a highly accurate voltage and current meter, with the capability to measure very low-level currents. Dc source status registers allow remote monitoring of a wide variety of dc source operating conditions.
The output of the dc source may be adjusted to any value within the boundaries shown. Page 21 3 Installation Inspection Damage When you receive your dc source, inspect it for any obvious damage that may have occurred during shipment.
If there is damage, notify the shipping carrier and the nearest HP Sales and Support Office immediately. Warranty information is printed in the front of this guide. Page 22 3 - Installation Location The outline diagram in figure gives the dimensions of your dc source. The dc source must be installed in a location that allows sufficient space at the sides and back of the unit for adequate air circulation see Bench Operation.
Bench Operation A fan cools the dc source by drawing air in through the sides and exhausting it out the back. Minimum clearances for bench operation are 1 inch 25 mm along the sides. Do not block the fan exhaust at the rear of the unit. Unscrew the line fuse cap from the rear panel and verify that the fuse rating matches what is specified on the FUSES label on the rear panel. Reinstall the fuse. See table for fuse part numbers. Connect the power cord to the IEC connector on the rear of the unit.
Page 24 3 - Installation Voltage Drops The load wires must also be large enough to avoid excessive voltage drops due to the impedance of the wires. In general, if the wires are heavy enough to carry the maximum short circuit current without overheating, excessive voltage drops will not be a problem.
The voltage drops across the load wires should be limited to less than two volts. Refer to Table to calculate the voltage drop for some commonly used AWG copper wire. Page 25 Installation - 3 Under normal operation, the dc source senses the output voltage at the output terminals on the back of the unit. External sense terminals are available on the back of the unit that allow the output voltages to be sensed at the load, compensating for impedance losses in the load wiring.
You cannot remote sense at the optional front panel binding posts. Page 26 3 - Installation at the load. When using remote sensing, you must program the OVP trip voltage high enough to compensate for the voltage drop between the output terminals and the load.
When set to Fast mode, this switch disconnects the output capacitor that is located inside the unit. Fast mode lets you improve or enhance certain operating characteristics; while at the same time degrading other operating characteristics. Page 28 3 - Installation This rear panel connector, has a fault output port and an inhibit input port. The fault FLT output, also referred to as the DFI discrete fault indicator signal in the front panel and SCPI commands, is an open collector circuit that pulls the positive output low with respect to the negative chassis referenced common.
HP-IB address data is stored in non-volatile memory. The dc source is shipped with its HP-IB address set to 5. Page 31 4 Turn-On Checkout Introduction Successful tests in this chapter provide a high degree of confidence that the dc source is operating properly.
For verification tests, see appendix B. Complete performance tests are given in the Service Guide. NOTE: This chapter provides a preliminary introduction to the dc source front panel.
See chapter 5 for more details. Using the Keypad shift p and Some of the front panel keys perform two functions, one labeled in black and the other in blue. Page 32 4 - Turn-On Checkout Checkout Procedure The test in this section checks for output voltage and current on the dc source.
NOTE: To perform the checkout procedure, you will need a wire for shorting the output terminals together. The following procedure assumes that the unit turns on in the factory-default state. Page 33 Turn-On Checkout - 4 Procedure 6. The output dropped to zero, CV turned off, and Prot turned on.
Press Shift, OV, , Enter 8. Press Shift, Prot Clear 9. In either case, the display may show an error message that indicates the reason for the failure. Selftest Errors Pressing the Shift, Error keys will show the error number. If this occurs, turn the power off and then back on to see if the error persists. Press the Local key on the front panel to put the unit in local mode.
Front Panel Description 2 1 5 3 4 6 7 8 Figure Page 36 5 - Front Panel Operation j Display character vacuum fluorescent display for showing output measurements and programmed values.
CC The dc source output is in constant-current mode. Unr The dc source output is in an unregulated state. Dis The dc source output is disabled off. OCP The overcurrent protection state is enabled. Page 37 Front Panel Operation - 5 System Keys Refer to the examples later in this chapter for more details on the use of these keys.
System Keys This is the blue, unlabeled key, which is also shown as Shift in this guide. Release the key after you press it. The Shift annunciator is lit, indicating that the shifted keys are active. Page 38 5 - Front Panel Operation Function Keys Refer to the examples later in this chapter for more details on the use of these keys.
Function Keys Immediate Action Keys Immediate action keys immediately execute their corresponding function when pressed. Other function keys have commands underneath them that are accessed when the key is pressed. When the unit is operating in front panel meter mode, all front panel measurements are calculated from a total of readings taken at a Therefore, the total acquisition time for a single front panel measurement is about milliseconds.
Voltage Press this key to access the voltage menu. Page 41 Front Panel Operation - 5 Entry Keys Refer to the examples later in this chapter for more details on the use of these keys. Parameter lists are circular; you can return to the starting position by continuously pressing either key.
Page 43 Front Panel Operation - 5 2 - Querying and Clearing Output Protection The dc source will disable its output if it detects an overvoltage or overcurrent fault condition. Other automatic fault conditions such as overtemperature also will disable the output. Query and clear the dc source overcurrent protection feature as follows: Action Display 1.
On the Function keypad, press Protect. In this example, OC indicates that an overcurrent condition has occurred. Page 44 5 - Front Panel Operation As previously mentioned, the HP A dc source has the capability of measuring output waveform parameters such as peak, minimum, high level, and low level as illustrated in the following figure.
In this mode the port functions as a remote inhibit input with a discrete fault indicator output signal. On the Function keypad, press Output. Scroll through the Output menu by pressing q.
Page 46 5 - Front Panel Operation 5 - Programming the Output Relay option only Units with option have isolation and polarity reversal relays connected to the output and sense terminals. Option is not available on HP B units. You can save up to 4 states from location 0 to location 3 in non-volatile memory and recall them from the front panel. All programmable settings are saved. Save an operating state in location 1 as follows: Action 1. Set the instrument to the operating state that you want to save.
Save this state to location 1. Press Save, 1, Enter. Unless otherwise noted, specifications apply when measured at the rear terminals after a minute warm-up period.
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