Informations sur l'appareil:

Keithley 246 Compteur de fréquence
Fabricant:
Keithley
Modèle: 246
Date: 1967
Catégorie: Mètres
Groupe: Compteur de fréquence
Description: High Voltage Supply
Information:
                                    GENERAL

The Keithley model 246 is a high voltage supply which
provides accurate, stable outputs from 0 to 3100 volts dc.
Accuracy is ±1% of the dial setting for all outputs.
Stability is ±0.01% ±2 millivolts the first hour or in
subsequent 8-hour periods, after a 1-hour warm-up. Line
regulation is 0.001% plus 2 millivolts for a 10% change in
line voltage, and load regulation is 0.002% plus 2
millivolts from no load to full load.

FEATURES.

a.	Three in-line calibrated dials set the output voltage in
10-volt steps. The fourth dial is a potentiometer that
permits interpolation between steps with 50-millivolt
resolution. Output can be selected positive or negative with
respect to ground.

b.	Repeated overloading or operation in an overload
condition for long periods will not damage the model 246.
Overload protection limits the output current to less than
13 milliamperes and, when the overload is removed,
automatically returns the Supply to its set value .

c.	The circuit for the model 246 takes advantage of the
reliability and stability of a solid-state comparator
amplifier, and the high voltage capability of two stacked
series regulator tubes to provide a high performance
circuit. Metal-film range resistors and a selected zener
diode contribute to its overall accuracy and stability.

1-3. APPLICATIONS.

a.	The model 246 is an ideal high voltage biasing supply for
photomultiplier tubes, ion chambers, photocells and other
current detectors. It is also suited for use in applications
such as voltage gradient studies, surface and volume
resistivity measurements and capacitor leakage measurements.

b.	The output of the Voltage Supply may be remotely
controlled or programmed by adding connectors to the rear
panel. Mounting holes are provided to easily modify the
model 246.

Ces manuels sont disponibles pour les équipements ci-dessus :

Type de document: Service et Manuel de l'utilisateur Keithley-11267-Manual-Page-1-Picture
Nombre de pages: 50
Taille du fichier: 4.30 Mbytes (4508326 Bytes)
langue: Anglais
Révision:
Document ID/Numéro:
Date: 01 janvier 1967
qualité: Document scanné, la lecture en partie mal, en partie illisible.
Chargé sur:
MD5: 6956bb818e90d082768ccbcafc4f8136
Téléchargements: 58 depuis 23 août 2018
Information:
model 246 SPECIFICATIONS. . . .		
		
1,	, GENERAL DESCRIPTION  ... 	
		
	1-1.	General  ... 
	1-2.	
	1-3.	Applications ... 
		
2,	. OPERATION  ... 	
		
	2-1.	Connections  ... 
	2-2.	Preliminary Procedures.
	2-3.	Operating Checks. . . .
	2-4.	Setting Output Voltage.
	2-5.	Overload Operation. . .
	2-6.	Capacitive Loads. . . .
	2-7.	Output Noise ... 
	2-8.	Short-Term Stability, .
	2-9.	Temperature Coefficient
	2-10.	Remote Programing . . .
	2-11.	model 246 Modifications
		for Resistance
		Programing ... 
	2-12.	Circuit for Resistance
		Programing ... 
	2-13.	Operation for Resistance
j		Programing ... 
	2-14.	model 246 Modifications
		for Voltage Programing.
	2-15.	Circuit for Voltage
		Programing ... 
	2-16.	Operation for Voltage	
		Programing ... 	. 11
			
3.	, CIRCUIT DESCRIPTION. . . .		. 13
			
	3-1.	General ... 	. 13
	3-2.	High and Low Voltage	
		Supplies  ... 	. 13
	3-3.	Voltage Control. . . .	. 13
	3-4.	Output Voltage  ... 	. 14
	3-5.	Current Control. . , .	. 14
			
4.	. SERVICING ... 		. 15
			
	4-1.	General.  ... 	. 15
	4-2.	Servicing Schedule . .	. 15
	4-3.	Parts Replacement. . .	. 15
	4-4.	Troubleshooting. . . .	. 17
	4-5.	Procedures to Guide	
		Troubleshooting. . . .	. 17
	4-6.	Transformer Check.. , .	. 18
	4-7.	Troubleshooting the Volt-	
		age Control Amplifier.	. 18
	4-8.	Troubleshooting the	
		Current Limit Circuits	. 18
	4-9.	Troubleshooting the	
		Overload Lamp Circuit.	. 19
	4-10.	Output Noise  ... 	. 20
5. CALIBRATION  ... 		
		
5-1.	General  ... 	. 21
5-2.	Calibration Schedule. .	. 21
5-3.	Zero Balance Adjustment	. 21
5-4.	Voltage Calibration . .	. 21
5-5.	Current Limit Circuit	
		
		
6. Accessories  ... 		
		
6-1.	Rack Mounting  ... 	. 29
6-2.	Model 3008 Bench	
	Mounting Kit ... 	
6-3.	MHV Mating Connector	
	Cable Assemblage. . . .	. 30
		
7. REPLACEABLE PARTS  ... 		
		
7-1.	Replaceable Parts List.	. 33
7-2.	How to Order Parts. . .	. 33
	model 246 Replaceable	
		. 34
	model 246 Schematic	
	Diagram 21176E ... 	. 41
	Green Calibration and	
		
^Change Notice Last		page
		
* Yellow change notice sheet is		in-
eluded only for instrument modifi-		
Keithley-11267-Manual-Page-1-Picture


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