| DC-to-30 MHz fast-rise high-gain |
| Rise time .006uS |
| .05 - 20 V/CM AC/DC coupled |
| .005 - 2 V/CM AC coupled ( x10 gain) |
|
|
 |
General Information
The Type L Plug-In is a fast-rise, high gain, calibrated preamplifier designed for use with the Tektronix
530-, 540-, 550-, and 580- Series oscilloscopes. (Type 81 Plug-In adapter must be used with the 580-Series
Oscilloscopes.) The unit contains a fast-rise DC amplifier similar to the Type K Plug-In Unit, plus a
fast-rise high-gain AC amplifier which may be used to increase the sensitivity by a factor of 10.
The L Unit alone has a risetime of 6 nanoseconds in AC or DC and 10 nanoseconds in X10 GAIN AC. Table 1-1
summarizes risetimes and bandwidth (upper bandwidth figure measured at a 3 dB point) when the L Unit is used
in combination with various types of Tektronix oscilloscopes.
Vertical Deflection Factors
AC or DC position of AC-DC switch: 0.05 to 20 volts per centimeter in nine calibrated steps; also
continuously variable (uncalibrated) between steps, and up to approximately 50 volts per centimeter.
X10 GAIN AC position of AC-DC switch: 0.005 to 2 volts per centimeter in nine calibrated steps; also
continuously varible (uncalibrated) between steps, and up to approximately 5 volts per centimeter.
| |
Step Attenuator (VOLTS/CM switch) Accuracy
Within 3% of front-panel reading for all positions of VOLTS/CM switch.
Input Characteristics
Type L Plug-n Unit: 1 Megohm shunted by 20 picofarads.
Type P6017 Probe: 10 Megohms shunted by 14 picofarads.
Type P6000 Probe: 10 megohms shunted by 11.5 picofarads.
Type P510 Probe: 10 Megohms shunted by 14 picofarads.
Type P410 Probe: 10 Megohms shunted by 8 picofarads.
Maximum Allowable Combined DC and Peak AC Input
600 volts, AC-coupled.
|
| TABLE 1-1. TRANSIENT RESPONSE AND BANDPASS |
|---|
Type L Unit
with Oscilloscope
Type: | RISETIME in nanoseconds | BANDWIDTH |
|---|
Coupling
AC or DC | Coupling
X10 GAIN AC | Coupling
DC | Coupling
AC *** | Coupling
X10 GAIN AC |
| 532 | 70 | 70 | DC to 5 MHz | 2 Hz to 5 MHz | 3 Hz to 5 MHz |
544
541/541A
543/543A/543B
545/545A/545B
546/547
549
555
556 |
12 | 15 | DC to 30 MHz | 2 Hz to 30 MHz | 3 Hz to 24 MHz |
531A
533/533A
535A | 23 | 23 | DC to 15 MHz | 2 Hz to 15 MHz | 3 Hz to 15 MHz |
*581
*585 | 12 | 15 | DC to 30 MHz | 2 Hz to 30 MHz | 3 Hz to 24 MHz |
| 551 | 14 | 16 | DC to 25 MHz | 2 Hz to 25 MHz | 3 Hz to 22 MHz |
531
535
536 | 31 | 35 | DC to 11 MHz | 2 Hz to 11 MHz | 3 Hz to 11 MHz |
* Type 81 Plug-In adapter must be used with the 580-Series Oscilloscopes
*** AC low-frequency response is extended to 0.2 Hz with 10X probe.
above excerpts from Tektronix Type L Plug-In Instruction Manual
Markings and Functions of Controls
On the front panel of the L Unit, red markings are related to the red VARIABLE knob, blue and black
markings are related to the black knobs. The black-numbered scale around the VOLTS/CM switch is used when the
AC-DC switch is in AC or DC position, and the blue scale is used when the AC-DC switch is in X10 GAIN AC position.
First-Time Operation
To set the oscilloscope/Type L Plug-In Unit combination in operation for the first time the following procedure is suggested:
| 1. | Insert the Type L Unit into the plug-in compartment of the oscilloscope and tighten it with the securing rod. |
| 2. | Set the front-panel controls as follows (controls not mentioned may be in any position):
Oscilloscope:
| POWER | off |
| INTENSITY | fully counter-clockwise |
| HORIZONTAL DISPLAY | NORMAL ("A", INTERNAL SWEEP) |
| MAGNIFIER (5X MAG.) | OFF |
Main Sweep Controls:
| TIME/CM | 0.5 MILLISEC |
| VARIABLE, TIME/CM | CALIBRATED, fully clockwise |
| TRIGGER SLOPE | -INT.(-) |
| TRIGGERING MODE | AC (AC SLOW) |
| (TRIGGERING SOURCE) | (INT.) |
| STABILITY | fully clockwise |
| TRIGGERING LEVEL | fully clockwise |
Type L Plug-In Unit:
| AC-DC | DC |
| VOLTS/CM | 0.5 (black numbers) |
| VARIABLE, VOLTS/CM | CALIBRATED, fully clockwise |
| 3. | Connect the power cord to the instrument and to the source of power. |
| 4. | Turn ON the POWER switch. Allow a minute for the filaments to heat and the
time-delay relay to operate. |
| 5. | Before increasing the intensity, center the trace vertically with the
VERTICAL POSITION control, using the Beam Indicator neons of the oscilloscope as a guide. (When both vertical
Beam Indicator neons are unlit, the trace is approximately centered. |
| 6. | Rotate the INTENSITY control clockwise until the free-running trace appears on
the crt. Center the trace with the vertical and horizontal positioning controls. |
| 7. | Adjust the FOCUS, ASIGMATISM and INTENSITY controls to obtain a sharp trace with
adequate intensity. |
| 8. | Let the instrument warm up for at least 15 minutes before making any adjustment
changes or accurate observations. |
|
above excerpts from Tektronix Type L Plug-In Instruction Manual
| Knobs |
| 366-040 | Knob, Large Black, 1.375 OD 1/4" hole thru (VOLTS/CM) |
| 366-038 | Knob, Small Red (Variable) |
| 366-028 | Knob, Large Black, 1.225 flange (Vertical Position) |
| 366-028 | Knob, Large Black, 1.225 flange (AC-DC X10 Gain) |
| Pots/Switches |
| SW5002 | 260-173 | Rotary Switch (AC-DC X10 Gain) |
| SW5052 | 260-172 | Rotary Switch (Volts/CM) |
| R5362 | 050-171 | 680 ohm var WW (VARIABLE) |
| R6522 | 311-028 | 2 x 100k var (VERTICAL POSITION) |
| R6392 | 311-012 | 5k 2w var (Gain Adj) |
| R6052 | 050-035 | 270 ohm var ww (X10 Gain Adj) |
| R6242 | 311-026 | 100k 2w var (X10 DC Bal) |
| R6812 | 311-003 | 100 ohms var (DC Bal) |
| Tubes |
| V5832 | 157-0117-00 | 5654 Checked |
| V5942 | 154-084 | 5654 (or 6AK5) |
| V6042 | 154-084 | 5654 (or 6AK5) |
| V6132 | 154-084 | 5654 (or 6AK5) |
| V6242 | 157-038 | 8426 |
| V6342 | 157-038 | 8426 |
| V6632 | 154-039 | 12AT7 |
| V6732 | 154-039 | 12AT7 |
|
